高中英语外研版（2019）必修第三册 Unit 3 Period 4 同步练习

She to solve the problem as well.

When it comes to developing our economy, we must .

More and more carbon dioxide is being released into the air， severer global warming effects.

Success in making money is a good criterion of success in life.

I have no idea  further.

Benjamin Franklin was one of the Founding Fathers of the United States. Apart being a successful statesman, he was also a (create) scientist and inventor.

Benjamin Franklin (fly) a kite during a storm in 1752. He raised the kite with a piece of string (tie) to it. A metal key was attached to the string. A flash of lightning hit the kite, and electricity was conducted through the string to the key. Franklin then touched the key and got electric shock.

Generations of children have been amazed by his (brave) and his scientific approach to (look) for the truth. However, new research suggests that the story may be fiction instead of fact. More than one scientist has questioned really happened. They all agree that if Franklin had (actual) touched the key, he would certainly have died from the electric shock.

In science, facts should (prove) by experiments and research, and we should not always believe everything we read or hear—even if it is a great story.

"You care for nothing but shooting dogs and catching rats. You will shame yourself and all your family," Darwin's father once said to him.

Most people know that Charles Darwin was the father of evolutionary biology. However, what is not widely known is what sort of person he was.

In his autobiography (自传), Darwin described himself as a rather "naughty" child. He stole fruit from the trees on the side of his parents' house, made up wild stories, and tried to be the center of attention in the family.

Even worse, it seemed that Charles Darwin was a lazy young man and a slow learner at grammar school. He was a rather shy student but he did take great pleasure in showing off his athletic skills to the other schoolboys. It is not known how well Darwin did at school, but we could say that he was likely to be an        student.

When Darwin was nine years old, his father sent him to a boy's boarding school. At this school, Darwin learned classics, ancient history and Greek, all of which he found boring. He was not inspired much by his schooling. He found his only pleasure there was reading Shakespeare's historical plays, and the poems of Byron, Scott, and Thomson. His increased interest in natural science was encouraged by events outside his formal education.

As Darwin grew older, collecting became his major hobby. It became very clear that Darwin was not taking his studies seriously.

The world's first hydrogen­powered (氢动力的) trains have begun running in Germany. They began carrying passengers on Monday in Germany's northern Lower Saxony state. The new trains will run 100­kilometre trips and can travel up to 140 kilometers per hour.

A French railroad company called Alstom built the two trains. Teams in Germany and France worked together on the project, which was supported by the German government. The new train model, called the Coradia iLint, signals the beginning of efforts in Germany and other nations to move away from pollution­producing diesel (柴油) trains.

The Coradia iLint is designed to run on non­electrified train lines with low levels of noise. It uses a process that combines hydrogen with oxygen to produce electrical power. If the system produces more energy than the train needs at that time, it can store the extra energy in batteries. The only emissions (排放物) are water and steam.

Hydrogen­powered trains cost more than diesel trains to build. But Alstom officials say the operating costs are much lower. The company plans to provide another 14 Coradia iLint trains to Lower Saxony.

The head of railroad operations in the area, Carmen Schwabl, praised replacing diesel trains with hydrogen­powered trains. She said the move was an important first step in using clean­burning technologies to reach climate protection goals.

Alstom says several other European countries have also expressed interest in developing hydrogen train systems. France has already said it wants its first hydrogen train to be on the rails by 2022.

I remember it was a Saturday. I was invited to my friend's birthday party.1the first time, I was the first one there. I sat on her couch and just waited2for the party to begin. As a flood of guests came in with warm3, there was one short, thin girl who had a huge smile on her face. She just seemed so4from the other girls there. So I decided to begin a conversation with her.

I asked her "Did your mum drive you here?" She answered," Oh, my mum was5." My heart sank. I continued, "When did she die?" "She died when I was seven."

Later on, she told us what had happened the day her mother died." I came home,6to tell my mum what a great day I had had.7I entered the room, I saw my mother on a stretcher (担架). I began8my sister. She just said, ‘Emma, Mum just needs to go to the hospital.'"

The girl said that she went to sleep that night with9, and woke up to be told by her sister, "Emma, please keep10. Mum's dead."

I was so11by this girl's story. She lost her mother at such a young age，but she made up her mind to be strong. With such a big weight of the world on her12, she looked positive and optimistic. She did not shed (流) a(n)13when telling us her story. Strength is something that can14pain at the worst time. She lives every day of her life to the fullest,15with a heavy heart.